Sharding_OrderModel_loadByKeys.php

<?php

   /**
     * An alias for BaseRepo::loadByKeys
     */
    protected static function loadByKeys(array $args, $byKeys = null)
    {
        if (static::SHARD_MAPPING_ID) {
            return static::shards()->first(function(BaseRepo $repo, Shard $shard) use ($arg, $byKeys) {
                return $repo->loadByKeys($args, $byKeys);
            });
        }
        return static::masterRepo()->loadByKeys($args, $byKeys);
    }